Improvement in sewing-machines



2Sheets-She-etl. A. S. DINSMORE.

Sawing-Machine. No.160512, Paten ted March 9, I875.

THE GRAPHIC G0.PHOT0.-LlTH-398=4I PARK PLAOE,N-Y-

UNrrnn Si're'rns PATnivrfOrrron ALFRED S. DINSMORE, OF BOSTON,MASSACHUSETTS.

.IMPROVEMENT IN SEWING=MACHINES.

Specification forming part of Letters Patent No. 160,5 1%, dated March9, 1575; application filed January 3, 1875.

To all whom it may concern:

Be it known that I, ALFRED S. DINSMORE, of Boston, in the county ofSuffolk and State of Massachusetts, have invented an ImprovedSewing-Machine, of which the following is a specification Y My inventionrelates to improvements in sewin g-machines for use in factories orother places where it is desired to unite piece-goods in order to formlong continuous pieces.

In my machine the fabrics to be united are impaled on pins projectingfrom a horizontally-moving circular baster plate orring,toothed at top,to be engaged and moved by toothed wheels actuated from a worm or othergear on a rotating shaft of the sewingmachine proper,

which is placed in a vertical position, or so that the needlereciprocates in substantially a horizontal plane.

My invention consists in the combination, with sewing mechanism and thetoothed baster-plate, of mechanism, substantially as hereinafterdescribed, for moving the baster-plate and fabric from a gear on thesewing-machine shaft; and also in the combination, with the gear formoving the baster-plate, of a pawl and ratchet, whereby the toothedwheel that engages the teeth of the baster-plate may be disengaged fromits operating-shaft, so that the baster-plate and fabric may be turnedfreely in either direction, so as to bring the fabric in positionquickly to receive the action ofthe needle.

Figure 1 is a top view of my invention. Fig. 2 is a side view of thebasterplate, with a part of its driving mechanism broken away, and Fig.3 is a view of the pawl and ratchet and toothed wheel for driving thebaster-plate.

In the drawing, A is the frame ofthe machine, circularin formto supportthe flanged supporting-ring R, on which rests and is moved thebaster-plate P, provided at top with teeth, and having projecting fromit fabric-holding pins 19, on which the fabric is impaled, and by whichthe fabric is suspended. A stitch-formingmech anism, preferably ofWillcox & Gibbs class, is supported on a standard, a, rising from theframe A, and is mounted ,with relation to the circularhorizontally-moving baster-plate, so that the baster-plate moves betweenthe hookshaft and presser-foot, and the needle works through aneedlehole made in the ring It.

The G-shaped arm B of the sewing-machine has its base attached to avertical standard, a, attached to frame A by screws m or otherwise, andthe hook-shaft I), provided with hook I) for forming, in connection withan eye-pointed needle, the usual chain-stitch, is driven by a belt, 0,over its fly-wheel O, the belt extending from such fly-wheel to afly-wheel, n,on a shaft,0, provided with fast and loose pulleys 0 0operated by power. The shaft 0 is supported in a bearing, 0 at the topof a standard rising from frame A. I do not, however, limit myself tothese devices for moving the shaft 1), as other suitable or well-knowndevices may be employed instead. The vibrating arm D, supported on armB, is connected with needle-carryin g bar d, and the arm is vibratedthrough the link 0 connected with it and with an eccentric on thehook-shaft b. On the needle-bar is a collar, 0, having a fingerprojecting from it toward the stock of the presser-foot f, and under asecond flanged collar, f, on such presserbar stock. This finger, as theneedle-bar rises, acts against the collar f, and lifts the presserfoot ffrom the fabric just as the point of the needle is withdrawn therefrom,in order to leave the fabric entirely free to be moved by thebaster-plate, and the said resser-foot again strikes the fabric just asthe needle is to penetrate the fabric. On the hook-shaft b isaworm-gear, 9, that engages a toothed wheel, g, mounted on a studprojecting from the standard a or other suitable support. On the collarof this wheel g is a toothed wheel, k, that engages a larger toothedwheel, h, on a shaft, 13, having an attached ratchet-wheel, '6. Thisshaft also carries a toothed wheel, j, mounted loosely thereon, but heldso as to move with the shaft by means of a pawl, 70, on the end of apin,is, having a milled nut, so that the operator of the machine may turnthe pawl by hand.

When the pawl k is in the position shown in Fig. 3, the rotation of theshaft i will move the toothed wheel, and, consequently, thebaster-plate, so as to carry the fabric along under the needle andperform sewing, and the spring 1 holds the pawl in engagement; but thepawl may be disengaged, when it is desired to move the baster-plate,without moving the sewing mechanism, as is often the case, to

place the fabric on the pins 10, and to move it quickly in place underthe needle, or to reverse or turn back the baster-plate in case ofimperfection in the sewing or seam.

When the pawl is turned away from the position shown in Fig. 3, thespring l bears on the back side of the pawl, and holds it from theratchet-wheel i. The needle is supplied with thread in the usual wayfrom a spool.

In operation, two pieces of fabric to be joined or sewed togetherareimpaled on the pins 12, the pawl 70 being disengaged from theratchet, and when the fabric is properly secured on the pins thebaster-plate is moved so as to bring the edge of the fabric under theneedle which works through a throat in the ring It. Then the pawl k isturned to engage the ratchet i, and the machine is started, after whichthe gears g g h h j move the baster-plate along the distance of a stitchat each revolution of the sh aft 1). The forward bearing 1' of the thehook-shaft b is curved to adapt it to the curved baster-plate.

The fabric is entirely relieved from friction of the presser when thebaster-plate is moving, and the presser-foot acts as a holder, toprevent any movement of the fabric while the needle is in the cloth.

I am aware that a baster-plate or cloth-supporting ring has been movedfrom aworm-gear on a shaft not forming part of the sewing mechanism, andconnected by gearing with the baster-plate, and this worm-shaft isbanded with the driving-shaft of the sewing-machine, but with suchconnections the movements of baster-plate and sewingmachine are notpositive at all times, and in myimprovement there is a less number ofparts, and they are more compactly arranged.

Having described my invention, I claim 1. The combination of therotatinghook-shaft audits wormgearwiththetoothed baster-plate, thetoothed wheel for moving the baster-plate, and connecting-gearing,substantially as described.

2. The combination of the hook-shaft and its worm-gear with the shaft I,operated from the hook-shaft by gearing, its ratchet, and the toothedwheel j and pawl, and the baster-plate, substantially as and for thepurpose set forth.

3. The combination of the horizontally-moving baster-plate with theneedle-bar, needle, presser-bar, presser, and finger and collar f,

the finger and collar holding the presser from the fabric while the feedtakes place or the baster-plate is moving, substantially as and for thepurpose set forth.

4. The combination of the frame A and its standard for supporting astitch forming mechanism with the circular and toothed hast er-plate,the supporting-ring, and mechanism actuated by the hook-shaft to movethe baster-plate, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALFRED S. DINSMORE.

Witnesses:

G. W. GREGORY, S. B. KIDDER.

